Gamma correction device, image conversion apparatus using...

Details Gamma correction device, image conversion apparatus using... Gamma correction device, image conversion apparatus using...

2006-03-20

2009-11-03

Hsia, Sherrie (Department: 2622)

Television

Image signal processing circuitry specific to television

Gray scale transformation

Reexamination Certificate

active

07612831

ABSTRACT:
There are provided a gamma correction device enabling correct gamma correction while reducing the capacity of a lookup table, an image conversion apparatus and a display device using the same. A gamma correction device for outputting, as an m-bit signal, a digital input signal having been inputted as an n-bit signal, m being a given number, the gamma correction device including a high-order LUT, a low-order LUT, a difference LUT, a data connecting section2, and an adder3, wherein each of the lookup tables has input bits fewer than n and output bits fewer than m, the high-order LUT has x-bit input and m1-bit output, the low-order LUT has (n−t)-bit input and m2-bit output, the difference LUT has (n−t)-bit input and k-bit output, m≦m1+m2, x<n−t and m≧m1+k are established, the data connecting section2outputs connection data obtained by connecting output bits of the high-order LUT on the high-order bit side and output bits of the difference LUT on the low-order bit side with m−m1−k bits of “0” being interposed between the output bits, and the adder3adds the connection data and the output value of the low-order LUT and outputs the added data.

REFERENCES:
patent: 6166781 (2000-12-01), Kwak et al.
patent: 7372507 (2008-05-01), Ikeda et al.
patent: HEI 6-6733 (1994-01-01), None
patent: 2000-148442 (2000-05-01), None
patent: 3071131 (2000-05-01), None
patent: 2003-288060 (2003-10-01), None

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